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Symbols meaning: \(P + Q\) means \(P\) is the father of \(Q\), and \(P - Q\) means \(P\) is the sister of \(Q\). Given \(A + B - C\), how is \(A\) related to \(C\)?

1. A is uncle of C
2. A is father of C
3. A is grandfather of C
4. A is brother of C

Correct answer: A is father of C

Solution

\(A + B\) means A is the father of B. Also, \(B - C\) means B is the sister of C, so B and C are siblings. Therefore, A is also the father of C.

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